Which of the following does not support the wave nature of light?

The magnitude of saturation photoelectric current depends upon

The work function of a metal is

One milliwatt of light of wavelength $4560 \ \mathring{A}$ is incident on a cesium surface of work function $1.9 \ eV$. Given that the quantum efficiency of photoelectric emission is $0.5\%$. Planck's constant $h = 6.62 \times 10^{-34} \ J \cdot s$,velocity of light $c = 3 \times 10^8 \ m/s$,the corresponding photoelectric current is:

Define the work function of a metal and write its unit.

Which of the following phenomena exhibits the particle nature of light?